1 files changed, 110 insertions, 0 deletions
diff --git a/src/serialization/variant.h b/src/serialization/variant.h
new file mode 100644
index 000000000..3b92fde20
--- /dev/null
+++ b/src/serialization/variant.h
@@ -0,0 +1,110 @@
+// Copyright (c) 2012-2013 The Cryptonote developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#pragma once
+
+#include <boost/variant/variant.hpp>
+#include <boost/variant/apply_visitor.hpp>
+#include <boost/variant/static_visitor.hpp>
+#include <boost/mpl/empty.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/mpl/front.hpp>
+#include <boost/mpl/pop_front.hpp>
+#include "serialization.h"
+
+template <class Archive, class T>
+struct variant_serialization_traits
+{
+};
+
+template <class Archive, class Variant, class TBegin, class TEnd>
+struct variant_reader
+{
+  typedef typename Archive::variant_tag_type variant_tag_type;
+  typedef typename boost::mpl::next<TBegin>::type TNext;
+  typedef typename boost::mpl::deref<TBegin>::type current_type;
+
+  static inline bool read(Archive &ar, Variant &v, variant_tag_type t)
+  {
+    if (variant_serialization_traits<Archive, current_type>::get_tag() == t) {
+      current_type x;
+      if(!::do_serialize(ar, x))
+      {
+        ar.stream().setstate(std::ios::failbit);
+        return false;
+      }
+      v = x;
+    } else {
+      return variant_reader<Archive, Variant, TNext, TEnd>::read(ar, v, t);
+    }
+    return true;
+  }
+};
+
+template <class Archive, class Variant, class TBegin>
+struct variant_reader<Archive, Variant, TBegin, TBegin>
+{
+  typedef typename Archive::variant_tag_type variant_tag_type;
+
+  static inline bool read(Archive &ar, Variant &v, variant_tag_type t)
+  {
+    ar.stream().setstate(std::ios::failbit);
+    return false;
+  }
+
+};
+
+
+template <template <bool> class Archive, BOOST_VARIANT_ENUM_PARAMS(typename T)>
+struct serializer<Archive<false>, boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>>
+{
+  typedef boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> variant_type;
+  typedef typename Archive<false>::variant_tag_type variant_tag_type;
+  typedef typename variant_type::types types;
+
+  static bool serialize(Archive<false> &ar, variant_type &v) {
+    variant_tag_type t;
+    ar.begin_variant();
+    ar.read_variant_tag(t);
+    if(!variant_reader<Archive<false>, variant_type, typename boost::mpl::begin<types>::type, typename boost::mpl::end<types>::type>::read(ar, v, t))
+    {
+      ar.stream().setstate(std::ios::failbit);
+      return false;
+    }
+    ar.end_variant();
+    return true;
+  }
+};
+
+template <template <bool> class Archive, BOOST_VARIANT_ENUM_PARAMS(typename T)>
+struct serializer<Archive<true>, boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>>
+{
+  typedef boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> variant_type;
+  //typedef typename Archive<true>::variant_tag_type variant_tag_type;
+
+  struct visitor : public boost::static_visitor<bool>
+  {
+    Archive<true> &ar;
+
+    visitor(Archive<true> &a) : ar(a) { }
+
+    template <class T>
+    bool operator ()(T &rv) const
+    {
+      ar.begin_variant();
+      ar.write_variant_tag(variant_serialization_traits<Archive<true>, T>::get_tag());
+      if(!::do_serialize(ar, rv))
+      {
+        ar.stream().setstate(std::ios::failbit);
+        return false;
+      }
+      ar.end_variant();
+      return true;
+    }
+  };
+
+  static bool serialize(Archive<true> &ar, variant_type &v) {
+    return boost::apply_visitor(visitor(ar), v);
+  }
+};